Raspberry Pi_Eng_02.8 GPIO

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2.8 GPIO

Raspberry Pi is not only able to use the resources in the system, but also has functions to communicate with various external devices and control them through the interface. It can process input or output with an external device, or adjust an external device. It is possible to implement a function of receiving various measurement values from an external sensor to judge a situation and performing appropriate processing accordingly. It is also possible to build a system that directly controls an external system by creating an Embedded Program.

Raspberry Pi_Eng_02.7.3 Bluetooth Device

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2.7.3 Bluetooth Device

Recently, various peripherals support Bluetooth, and Raspberry Pi also provides Bluetooth function from Raspberry Pi 3 model B to support it. With this function, you can access Raspberry Pi by using external Bluetooth device such as mobile phone and utilize various functions.

Bluetooth provided by Raspberry Pi supports Bluetooth 4.1 and Bluetooth Low Energy (BLE).

In order to use Bluetooth, some additional setting is required. Please refer to [11.8 Configuration and Connection] for more information.

Raspberry Pi_Eng_02.7.2 Wi-Fi Device

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2.7.2 Wi-Fi Device

Depending on the environment in which Raspberry Pi is installed, when Raspberry Pi requires a network connection function, there are many cases where it is more advantageous to connect wirelessly than to connect by wire.

From the Raspberry Pi 3 model B, Raspberry has built-in Wi-Fi that supports 802.11 b/g/n wireless LAN. Therefore, you can wirelessly connect to the LAN network without using additional Wi-Fi access devices and utilize the communication function.

To use Wi-Fi, you need to make some settings. Please refer to the description in [11.5 Wireless Connection] for more information.

Raspberry Pi_Eng_02.7.1 Ethernet Port

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2.7 Network Device

2.7.1 Ethernet Port

As Raspberry Pi has been used for various purposes, it has become increasingly necessary to interwork with external networks to increase utilization.

Raspberry Pi is provided with an Ethernet port for communication using a LAN cable. The Ethernet port is available as standard starting with the Raspberry Pi 1 model B+ announced in mid-2014, and supports high-speed 100 Mbit/s Ethernet. If you do not need the network function, you can use the model A series.

When you connect a LAN cable to the Ethernet port and connect it to the network, it basically connects to the network and operates automatically. If you want to adjust the connection method, please refer to [11.4 Wired Network ConnectionWired Network ].

Raspberry Pi_Eng_02.6.2 Power Constraints of USB Port

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2.6.2 Power Constraints of USB Port

The required power level of USB devices is defined in 100mA increments from 100mA to 500mA. When a USB device is first connected to a computer, it informs the USB Host of its required power requirements. In theory, the actual power used by a USB device should not exceed its self-defined limits.

The USB ports on the Raspberry Pi are designed to withstand loads of at least 100mA each, which is sufficient to operate low-power devices such as mouse and keyboards. However, devices such as Wi-Fi adapter, USB hard drive, and USB pen drive may consume much more power depending on the USB device. Thus, if Raspberry Pi’s own power is insufficient, it is good to use an external USB hub with separate power supply. Of course you can connect a USB device that uses 500mA power directly to the USB port of Raspberry Pi, and operate the USB device by supplying enough power to the Raspberry Pi, but if the power is insufficient, it is difficult to guarantee reliable operation.

Raspberry Pi_Eng_02.6.1 USB Port by Model

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2.6 USB port

2.6.1 USB Port by Model

Nowadays, many peripherals such as a keyboard, a mouse, and a camera are all connected to the computer main body through USB.

The Raspberry Pi system also provides a USB port that supports USB 2.0. As Linux already have drivers installed for most peripherals, so you can plug your peripherals into a Raspberry Pi system for immediate use.

Raspberry Pi_Eng_02.5.4 3.5mm Audio Jack and Composite Video

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2.5.4 3.5mm Audio Jack and Composite Video

The Raspberry Pi offers a 3.5 m audio jack to support stereo. When using HDMI output from Raspberry Pi, audio output can also be transmitted to the HDMI port together with video output, so that external device can play video and audio at once. However, if separate audio output such as a speaker and a headphone is required, audio may be outputted separately through an audio jack.

Raspberry Pi_Eng_02.5.3 DSI Display Port

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2.5.3 DSI Display Port

Raspberry Pi supports DSI (Digital Serial Interface) connection to support TFT-LCD display. When connecting the device, you can connect it to the DSI display port protected by a plastic layer over the SD card slot on the top of the printed circuit board.

In addition, in order to use Raspberry Pi with a touch screen without a keyboard or mouse, touch-screen drivers that support 10-finger touch and on-screen keyboards is integrated in the latest version of the Raspbian operating system.

Raspberry Pi_Eng_02.5.2 CSI Camera Interface

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2.5.2 CSI Camera Interface

Raspberry Pi can use a regular USB camera, but it has a device for Pi-only camera. You can connect a dedicated camera with a short ribbon cable to the CSI camera port on the board. The CSI port is connected to the ISP (Image System Pipeline) in SoC of Raspberry Pi. ISP processes the incoming camera data and converts it into image or video. Using this camera, we use 250mA of current.

Raspberry Pi_Eng_02.5.1 HDMI Video Port

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2.5.1 HDMI Video Port

In the past, VGA/DVI monitors were widely used video devices, but most modern monitors support High Definition Multimedia Interface (HDMI), which displays high-resolution images. The Raspberry Pi is designed to use Full HDMI output with full HD 1920×1080 resolution as the primary video output, and comes with an HDMI port to support it as a standard.